From your link, the methods appear to be:
Add a meta tag to your home page (proving that you have access to the source files). To use this method, you must be able to edit the HTML code of your site's pages.
Upload an HTML file with the name you specify to your server. To use this method, you must be able to upload new files to your server.
Verify via your domain name provider. To use this method, you must be able to sign in to your domain name provider (for example, GoDaddy.com or networksolutions.com) or hosting provider and add a new DNS record.
Add the Google Analytics code you use to track your site. To use this option, you must be an administrator on the Google Analytics account, and the tracking code must use the new asynchronous snippet.
I have the site I need to verify in a virtual sub-directory. I don't see I can use any of the first three methods.
I don't understand the fourth.
Using a plug-in to upload the Google verification HTML file was mentioned previously. How does one do that? What plug-in?